Per Us Weekly, which first broke the news, the 42-year-old thesp had invited his previously unidentified baby mama to move into his L.A. home while they awaited the arrival of the baby.

An insider told the magazine that he and the woman "used to date, but it wasn't serious" and that Jeremy was "being ultra-secretive" about it while she's "been going on about her life and not hiding it."

Renner is currently shooting David O. Russell's next film, a political thriller with no title just yet.

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